drivers/md/dm-ima.h

/* SPDX-License-Identifier: GPL-2.0
 *
 * Copyright (C) 2021 Microsoft Corporation
 *
 * Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
 *
 * File: dm-ima.h
 *       Header file for device mapper IMA measurements.
 */

#ifndef DM_IMA_H
#define DM_IMA_H

#define DM_IMA_MEASUREMENT_BUF_LEN	4096
#define DM_IMA_DEVICE_BUF_LEN		1024
#define DM_IMA_TARGET_METADATA_BUF_LEN	128
#define DM_IMA_TARGET_DATA_BUF_LEN	2048
#define DM_IMA_DEVICE_CAPACITY_BUF_LEN	128

#ifdef CONFIG_IMA

struct dm_ima_device_table_metadata {
	/*
	 * Contains data specific to the device which is common across
	 * all the targets in the table (e.g. name, uuid, major, minor, etc).
	 * The values are stored in comma separated list of key1=val1,key2=val2;
	 * pairs delimited by a semicolon at the end of the list.
	 */
	char *device_metadata;
	unsigned int device_metadata_len;
	unsigned int num_targets;

	/*
	 * Contains the sha256 hashes of the IMA measurements of the target
	 * attributes' key-value pairs from the active/inactive tables.
	 */
	char *hash;
	unsigned int hash_len;
};

/*
 * This structure contains device metadata, and table hash for
 * active and inactive tables for ima measurements.
 */
struct dm_ima_measurements {
	struct dm_ima_device_table_metadata active_table;
	struct dm_ima_device_table_metadata inactive_table;
};

void dm_ima_reset_data(struct mapped_device *md);
void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags);
void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);

#else

static inline void dm_ima_reset_data(struct mapped_device *md) {}
static inline void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}
static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}

#endif /* CONFIG_IMA */

#endif /* DM_IMA_H */